<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="js/vue.js"></script>
</head>
<body>
    <div id="app">
        <p>First name: <input type="text"v-model="firstName"></p>
        <p>Last name: <input type="text"v-model="lastName"></p>
        <p>fullname:{{fullname}}</p>
        <button @click="change">改变fullname</button>
    </div>
</body>
<script>
    var vm=new Vue({
    el:'#app',
    data:{
       firstName:'',
       lastName:''
    },
    methods: {
        change(){
            this.fullname='Harry Potter';
        }
    },
    computed:{
        fullname:{
            //getter用于读取
            get:function(){
                return this.firstName+''+this.lastName;
            },
            //setter写入时触发
            set:function(newVal){
                var arr = newVal.split('');
                this.firstName=arr[0];
                this.lastName=arr[1];
            }
        }
    }
    })
</script>
</html>
